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      11-28-2012, 11:30 AM   #7
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Drives: F10 M5 SpaceGray/SO
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Originally Posted by Nate@IND View Post
Wait until we install the AMS catless downpipes
I don't have experience with turbo motor exhaust, but I have to think that even with the various crimps and compromises in the stock exhaust, the largest obstruction to flow are the cats. When you get the AMS catless downpipes, is there any incentive for IND to test those pipes in an otherwise stock system? I'm sure the larger diameter tube and less restrictive mufflers of the aftermarket manufacturers will give more HP, but it would be interesting to learn the actual HP difference with just the cats eliminated. And I suppose with the cats gone there is the need for adjustment to the ECU, so that would have to come into play as well.

Last edited by Used2be; 11-28-2012 at 11:40 AM. Reason: afterthought